And any slow changes in the broadcast frequency would reveal information about the rotation and movement of the aliens' planets.

而信号波段的任何长期的变化都会显示外星球的自转和公转。

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When a composite video signal is broadcast over the airwaves by a TV station, it happens on a specific frequency.

当电视台要把组合视频信号经由无线电波广播出去时，要先把它调制到特定频率的载波上。

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Orthogonal Frequency Division Multiplexing (OFDM) is widely applied in modern digital television broadcast field due to its favorable performance.

正交频分复用(OFDM)因为其优良的性能在现代数字广播电视领域得到了广泛应用。

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This allowed us to create sample scenarios to showcase ingenuity and innovation, including how the mobile app can alert individuals on its location and areas to avoid for a fire, flood or terrorist attack, all by aggregating emergency frequency broadcast and GPS technology.

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